A gas occupies 500 cm³ at 760 mm Hg. At constant temperature, what is its volume at 950 mm Hg?
Correct answer C. 400 cm³
Explanation
Boyle's law gives V₂ = P₁V₁/P₂ = 760 × 500 ÷ 950 = 400 cm³. Inverting the pressure ratio gives the wrong value of 625 cm³.
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